playground/frontend/playground_components/lib/src/services/symbols/symbols_notifier.dart

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import 'dart:async';

import 'package:flutter/widgets.dart';
import 'package:highlight/highlight_core.dart';

import '../../models/symbols_dictionary.dart';
import 'loaders/abstract.dart';

class SymbolsNotifier extends ChangeNotifier {
  final _dictionaryFuturesByMode = <Mode, Future<SymbolsDictionary>>{};
  final _dictionariesByMode = <Mode, SymbolsDictionary>{};

  void addLoaderIfNot(Mode mode, AbstractSymbolsLoader loader) {
    unawaited(_load(mode, loader));
  }

  Future<void> _load(
    Mode mode,
    AbstractSymbolsLoader loader,
  ) async {
    final future = _dictionaryFuturesByMode[mode];

    if (future != null) {
      return;
    }

    _dictionaryFuturesByMode[mode] = loader.future;

    final dictionary = await loader.future;
    _dictionariesByMode[mode] = dictionary;
    notifyListeners();
  }

  SymbolsDictionary? getDictionary(Mode mode) => _dictionariesByMode[mode];
}